http://forums2.gardenweb.com/discussions/1572352/yellow-flowering-tall-standing-weed
Thanks - seems potentially an invader:
https://www.google.co.uk/amp/s/healingmagichands.wordpress.com/2007/09/27/nimby-plants-i-would-never-plant-again-oenothera-speciosa-showy-evening-primrose/amp/
I deliberately caused an invasion of Evening Primrose in my garden and I like it. They do smell lovely once the sun's gone down but they do seed easily though.
@ChasnotRobert started
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http://forums2.gardenweb.com/discussions/1572352/yellow-flowering-tall-standing-weed